linux-kernel - Re: [PATCH] qed: fix assignment of n_rq

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Date:   Mon, 27 Jul 2020 15:39:13 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Alexander Lobakin <alobakin@...vell.com>
Cc:     Michal Kalderon <mkalderon@...vell.com>,
        Ariel Elior <aelior@...vell.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Igor Russkikh <irusskikh@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-rdma@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] qed: fix assignment of n_rq_elems to incorrect params
 field

On 27/07/2020 15:36, Alexander Lobakin wrote:
> Hi Colin,
> 
> From: Colin King <colin.king@...onical.com>
> Date: Mon, 27 Jul 2020 15:17:12 +0100
> 
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Currently n_rq_elems is being assigned to params.elem_size instead of the
>> field params.num_elems.  Coverity is detecting this as a double assingment
>> to params.elem_size and reporting this as an usused value on the first
>> assignment.  Fix this.
>>
>> Addresses-Coverity: ("Unused value")
>> Fixes: b6db3f71c976 ("qed: simplify chain allocation with init params struct")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/infiniband/hw/qedr/verbs.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
>> index 5a80471577a6..4ce4e2eef6cc 100644
>> --- a/drivers/infiniband/hw/qedr/verbs.c
>> +++ b/drivers/infiniband/hw/qedr/verbs.c
>> @@ -1930,7 +1930,7 @@ qedr_roce_create_kernel_qp(struct qedr_dev *dev,
>>  	in_params->sq_pbl_ptr = qed_chain_get_pbl_phys(&qp->sq.pbl);
>>  
>>  	params.intended_use = QED_CHAIN_USE_TO_CONSUME_PRODUCE;
>> -	params.elem_size = n_rq_elems;
>> +	params.num_elems = n_rq_elems;
> 
> Sorry for copy'n'paste braino. Thanks for catching.

Kudos goes to Coverity, it's good at finding these buglets. :-)

> 
>>  	params.elem_size = QEDR_RQE_ELEMENT_SIZE;
>>  
>>  	rc = dev->ops->common->chain_alloc(dev->cdev, &qp->rq.pbl, &params);
>> -- 
>> 2.27.0
> 
> Acked-by: Alexander Lobakin <alobakin@...vell.com>
> 
> Al
>